CN208907406U - Fan and micro-wave oven - Google Patents

Abstract

The utility model relates to household appliance technical fields, disclose a kind of fan and micro-wave oven, the fan (20) includes wheel hub (21) and multiple blades (22) for being circumferentially evenly arranged on the wheel hub (21), it is formed with U-shaped groove (23) in the central region between leaf top (222) and blade root (221) of the suction surface (28) of at least partly described blade (22), and the opening direction of the U-shaped groove (23) is towards the wheel hub (21).In the fan of the utility model, since the central region of the suction surface in blade has additional U-shaped groove, play of the surfactant fluid on fan on blade radial direction can be effectively relieved in the U-shaped groove, to may make the flow resistance of blade surface smaller, and the flow losses of fluid are also smaller, so as to improve the mechanical efficiency of fan.

Description

Fan and micro-wave oven

Technical field

The utility model relates to household appliance technical fields, and in particular, to a kind of fan and micro-wave oven.

Background technique

Currently, micro-wave oven has been widely used in people's lives as the apparatus of heating food.Microwave is a kind of electromagnetism Wave, micro-wave oven is by magnetron, frequency converter or transformer, control circuit and cooks the part such as cavity and forms.Frequency converter or transformation Device is used to power to magnetron, and magnetron is used to provide microwave into cooking cavity to heat food.Meanwhile microwave oven internal master It to be radiated using axial fan assembly to the components such as transformer or frequency converter and magnetron.Axial fan assembly mainly includes Flabellum, collecting cover, blower tray and motor.It is positive correlation between flow and noise in aerofoil fan operational process.Work as wind It fans revolving speed to increase, flow increases, and noise level can also be promoted accordingly, and the high revolving speed of motor exacerbates the damage of motor Consumption, increases cost, while also resulting in reliability, safety issue.With the significantly promotion of people's living standard, fan Noise problem more and more attention has been paid to Gao Fengliang, low noise are the development trends of fan product.

In the existing fan with smooth surface blade, as the blade of fan constantly rotates and drives the sky of surrounding Gas constantly flows.When air flows through fan, due to blade in blade radial direction there are certain barometric gradient, be easy in leaf Biggish Passage Vortex is rolled on the surface of the central region (between the blade root and leaf top of blade) of piece, and Passage Vortex is with flowing Development constantly increases, while boundary layer is constantly accumulated, and leads to cause very big flow resistance, to cut down the through-flow energy of fan Power.And in fan, on blade, the maximum region of amount of work is the central region of blade, and then leads to the mechanical efficiency of fan simultaneously It is not high.

Utility model content

The purpose of the utility model is to provide a kind of fan, the mechanical efficiency of the blade of the fan is higher, air quantity is bigger.

To achieve the goals above, the utility model provides a kind of fan, including wheel hub and is circumferentially evenly arranged in this Multiple blades on wheel hub, the shape in the central region between Ye Dingyu blade root of the suction surface of at least partly described blade At there is a U-shaped groove, and the opening direction of the U-shaped groove is towards the wheel hub.

Preferably, multiple U-shaped grooves, the U-shaped groove are respectively formed on the suction surface of each blade It complies with the continuous arranged in rows of airflow direction and is configured to radially-arranged multiple rows of U-shaped trench cell along the blade, every row institute U-shaped trench cell is stated to extend from blade inlet edge to blade trailing edge.

Preferably, in the extending direction of each U-shaped trench cell, the two rows U-shaped trench cell of arbitrary neighborhood Arrangement interlaced with each other, so that each U-shaped groove in the U-shaped trench cell of adjacent two rows is staggered position each other.

Preferably, the extension path of the U-shaped groove is the one third end of the long axis direction of ellipse.

Preferably, the central region for being distributed the U-shaped groove is located at the high region of 60%~80% leaf of the blade.

Preferably, along the chord length direction of blade inlet edge to blade trailing edge, the U-shaped groove is arranged before the blade In genesis to the region of 60%~70% chord length length.

Preferably, the total depth of the U-shaped groove is 0.48mm~0.52mm.

Preferably, the channel bottom of the U-shaped groove is arc structure, the arc radius of the arc structure be 0.18mm~ 0.22mm。

Preferably, 4~8 blades are provided on the wheel hub.

In addition, the utility model additionally provides a kind of micro-wave oven, the micro-wave oven includes magnetron, frequency converter and above-mentioned The fan, the pressure face of the fan is towards the magnetron and frequency converter.

Through the above technical solutions, in the fan of the utility model, since the central region of the suction surface in blade increases Equipped with U-shaped groove, which can be effectively relieved play of the surfactant fluid on fan on blade radial direction, so as to So that the flow resistance of blade surface is smaller, and the flow losses of fluid are also smaller, so as to improve the mechanical efficiency of fan.

Other features and advantages of the utility model will the following detailed description will be given in the detailed implementation section.

Detailed description of the invention

Attached drawing is to be used to provide a further understanding of the present invention, and constitute part of specification, and following Specific embodiment be used to explain the utility model together, but do not constitute limitations of the present invention.In the accompanying drawings:

Fig. 1 is the top view according to the fan of preferred embodiments of the present invention；

Fig. 2 illustrates the arrangement schematic diagram of multiple rows of U-shaped trench cell in Fig. 1；

Fig. 3 illustrates a kind of shape of the extension path of preferred U-shaped groove, the shape and the long axis direction of ellipse The shape of one third end is identical；

Fig. 4 is the cross-sectional view of the partial blade on vane thickness direction, illustrates U-shaped groove in its depth direction Cross-section structure；

Fig. 5 is the explosive view of fan component；With

Fig. 6 is to illustrate the inside of micro-wave oven according to the perspective view of the micro-wave oven of preferred embodiments of the present invention Primary structure composition.

Description of symbols

1 magnetron, 2 fan component

3 frequency converter, 4 high-voltage diode

5 back plate, 6 microwave oven heating cavity body

7 bottom plate, 20 fan

21 wheel hub, 22 blade

23 U-shaped 24 collecting covers of groove

25 bracket, 26 motor

27 pressure face, 28 suction surface

221 blade root, 222 leaf top

223 blade inlet edge, 224 blade trailing edge

R arc radius h total depth

Specific embodiment

Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing.It should be understood that herein Described specific embodiment is only used for describing and explaining the present invention, and is not intended to limit the utility model.

In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower, top, bottom " is usually Be for direction shown in the drawings either for it is vertical, vertically or on gravity direction for each component mutual alignment Relationship description word.

The utility model provides a kind of novel fan, as shown in Figure 1, the fan 20 is equal including wheel hub 21 and circumferentially The even multiple blades 22 being arranged on the wheel hub 21, at least partly blade 22 suction surface 28 be located at leaf top 222 and blade root It is formed with U-shaped groove 23 in central region between 221, and the opening direction of U-shaped groove 23 is towards wheel hub 21.

Research has shown that in the course of work of the existing fan with smooth blades, the boundary layer meeting of blade surface Constantly it is superimposed, and during the internal vortex in these boundary layers gradually generates and develops, due to the fluid of blade surface Turbulent resistance and turbulent boundary layer inside subtle quasi-ordering whirlpool have biggish connection, and the phenomenon is in the central region of blade It is especially significant, therefore the mechanical efficiency of fan can be promoted by reducing the turbulent resistance of blade upper fluid, and do work in fan Measure the central region that maximum region is blade.In this regard, in the fan 20 of the utility model, due to the suction surface in blade 22 28 central region has additional U-shaped groove 23, which can be effectively relieved the surfactant fluid on fan 20 in 22 diameter of blade Play on direction, thus may make the flow resistance on 22 surface of blade smaller, and the flow losses of fluid are also smaller, thus The mechanical efficiency of fan 20 can be improved.

Wherein, referring to figure 1 and figure 2, multiple U-shaped grooves 23 are respectively formed on the suction surface 28 of each blade 22, The U-shaped groove 23 complies with the continuous arranged in rows of airflow direction and is configured to radially-arranged multiple rows of U-shaped groove list along blade 22 Member, every U-shaped trench cell of row extend from blade inlet edge 223 to blade trailing edge 224.In this way, the multiple rows of U-shaped groove list being evenly arranged Member can more effectively reduce the flow resistance of fluid.

Preferably, with continued reference to Fig. 2, in the extending direction of each U-shaped trench cell, the U-shaped groove of two rows of arbitrary neighborhood Unit arrangement interlaced with each other, so that each U-shaped groove 23 in the U-shaped trench cell of adjacent two rows is staggered position each other.

Wherein, the extension path of U-shaped groove 23 is preferably the one third end of the long axis direction of ellipse, referring to Fig. 3 It is shown.

In the present invention, the central region for being distributed U-shaped groove 23 is located at the high region of 60%~80% leaf of blade 22. Theoretically, fan 20 is maximum in the high region amount of work of 60%~80% leaf of blade, therefore, multiple U is arranged in the central region Type groove 23 can effectively improve the mechanical efficiency of the fan 20, promote the cooling air quantity of fan 20.

At the same time, along the chord length direction of blade inlet edge 223 to blade trailing edge 224, the setting of U-shaped groove 23 is from blade Leading edge 223 rises to the region of 60%~70% chord length length.

Wherein, shown in Figure 3, the total depth h of U-shaped groove 23 is 0.48mm~0.52mm.That is, the U on 22 surface of blade The total depth h of type groove 23 is 0.48mm~0.52mm.

Also, the channel bottom of U-shaped groove 23 is preferably arc structure, and the arc radius r of the arc structure is 0.18mm ~0.22mm.

In general, 4~8 blades 22 are provided on wheel hub 21, and referring to Fig. 1, a kind of preferred embodiment of the utility model In, 5 blades 22 are provided on wheel hub 21.And in general, the fan of the utility model is aerofoil fan.

In addition, the utility model additionally provides a kind of micro-wave oven, as shown in fig. 6, micro-wave oven includes magnetron 1, frequency converter 3 And above-mentioned fan 20, the pressure face 27 of fan 20 is towards magnetron 1 and frequency converter 3.Therefore, the micro-wave oven of the utility model All advantages of said fans 20 are also included, are no longer repeated one by one.

In general, micro-wave oven further includes bottom plate 7, back plate 5, microwave oven heating cavity body 6, high-voltage diode 4 and fan component 2 (including fan 20).As shown in figure 5, fan component 2 includes bracket 25, collecting cover 24, motor 26 and fan 20.Bracket 25 is logical It crosses fastener to be fixed in back plate 5, motor 26 is fixed on the bracket 25, and the shaft of motor 26 passes through in the wheel hub 21 of fan 20 Shaft mounting portion, the rear end of fan 20 is equipped with the collecting cover 24 drained towards magnetron 1.

Wherein, frequency converter 3 is used to power to magnetron 1, and magnetron 1 generates microwave and heats to the food in cavity 6, Magnetron 1 and frequency converter 3 are main heater element, and fan component 2 carries out wind-cooling heat dissipating to magnetron 1 and frequency converter 3.Its In, cavity 6 and frequency converter 3 are fixed on bottom plate 7, and magnetron 1 is fixed on the periphery wall of cavity 6.

When experiment, using the fan 20 of the utility model such as Fig. 1 (i.e. remodeling fan, blade 22 add U-shaped groove 23) Temperature rise test is carried out respectively with existing conventional Ian (smooth blades), measures pair of the temperature rise test to component each in micro-wave oven Than the results are shown in Table 1.

1 main heat sink electricity piece temperature rise test result of table

Therefore, the aeroperformance that can be seen that the fan 20 of the utility model from the result of above-mentioned test data obtains Certain improvement, so that the temperature of each main heat sink electricity piece in micro-wave oven is all improved.

Preferred embodiments of the present invention, still, the utility model and unlimited are described in detail in conjunction with attached drawing above Detail in above embodiment can be to the skill of the utility model in the range of the technology design of the utility model Art scheme carries out a variety of simple variants, these simple variants belong to the protection scope of the utility model.

It is further to note that specific technical features described in the above specific embodiments, in not lance In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the utility model is to each No further explanation will be given for the possible combination of kind.

In addition, any combination can also be carried out between a variety of different embodiments of the utility model, as long as it is not disobeyed The thought for carrying on the back the utility model, equally should be considered as content disclosed in the utility model.

Claims (10)

1. a kind of fan, the multiple blades (22) including wheel hub (21) and being circumferentially evenly arranged on the wheel hub (21) are special Sign is, at the middle part between leaf top (222) and blade root (221) of the suction surface (28) of at least partly described blade (22) It is formed on region U-shaped groove (23), and the opening direction of the U-shaped groove (23) is towards the wheel hub (21).

2. fan according to claim 1, which is characterized in that divide on the suction surface (28) of each blade (22) It is not formed with multiple U-shaped grooves (23), which complies with the continuous arranged in rows of airflow direction and be configured to along institute State radially-arranged multiple rows of U-shaped trench cell of blade (22), U-shaped trench cell described in every row is from blade inlet edge (223) Xiang Ye Piece trailing edge (224) extends.

3. fan according to claim 2, which is characterized in that in the extending direction of each U-shaped trench cell, arbitrarily The adjacent two rows U-shaped trench cell arrangement interlaced with each other, so that each institute in the U-shaped trench cell of adjacent two rows U-shaped groove (23) is stated to be staggered position each other.

4. fan according to claim 1, which is characterized in that the extension path of the U-shaped groove (23) is oval The one third end of long axis direction.

5. fan described in any one according to claim 1~4, which is characterized in that the distribution U-shaped groove (23) The central region is located at the high region of 60%~80% leaf of the blade (22).

6. fan according to claim 5, which is characterized in that along the chord length of blade inlet edge (223) to blade trailing edge (224) On direction, U-shaped groove (23) setting from the blade inlet edge (223) to the region of 60%~70% chord length length It is interior.

7. fan described in any one according to claim 1~4, which is characterized in that the aggregate depth of the U-shaped groove (23) Spending (h) is 0.48mm~0.52mm.

8. fan according to claim 7, which is characterized in that the channel bottom of the U-shaped groove (23) is circular arc knot Structure, the arc radius (r) of the arc structure are 0.18mm~0.22mm.

9. fan according to claim 8, which is characterized in that be provided with 4~8 blades on the wheel hub (21) (22)。

10. a kind of micro-wave oven, which is characterized in that the micro-wave oven includes magnetron (1), frequency converter (3) and wanted according to right The pressure face (27) of fan described in asking any one of 1~9 (20), the fan (20) towards the magnetron (1) and becomes Frequency device (3).